
of \(a_\mu \) , where \(a_q(u,v) :=\int _{\Omega }(A_q(x) \nabla u(x))\cdot \nabla v(x)\operatorname{d}\hspace{-1.25pt} x\) .
In case \(A_\mu \)  does not exhibit such a decomposition, empirical interpolation [1]}
can be used to obtain an approximate decomposition of \(A_\mu \) .
